131 lines
2.7 KiB
C
131 lines
2.7 KiB
C
/*
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* $Id: awk.c,v 1.12 2006-01-29 18:28:14 bacon Exp $
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*/
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#include <xp/awk/awk.h>
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#ifndef __STAND_ALONE
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#include <xp/bas/memory.h>
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#include <xp/bas/assert.h>
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#endif
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xp_awk_t* xp_awk_open (xp_awk_t* awk)
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{
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if (awk == XP_NULL) {
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awk = (xp_awk_t*) xp_malloc (xp_sizeof(awk));
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if (awk == XP_NULL) return XP_NULL;
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awk->__dynamic = xp_true;
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}
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else awk->__dynamic = xp_false;
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if (xp_str_open(&awk->token.name, 128) == XP_NULL) {
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if (awk->__dynamic) xp_free (awk);
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return XP_NULL;
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}
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if (xp_awk_tab_open(&awk->parse.func) == XP_NULL) {
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xp_str_close (&awk->token.name);
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if (awk->__dynamic) xp_free (awk);
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return XP_NULL;
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}
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awk->opt = 0;
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awk->errnum = XP_AWK_ENOERR;
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awk->src_func = XP_NULL;
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awk->in_func = XP_NULL;
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awk->out_func = XP_NULL;
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awk->src_arg = XP_NULL;
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awk->in_arg = XP_NULL;
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awk->out_arg = XP_NULL;
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awk->tree.begin = XP_NULL;
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awk->tree.end = XP_NULL;
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awk->tree.unnamed = XP_NULL;
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//awk->tree.funcs = XP_NULL;
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awk->lex.curc = XP_CHAR_EOF;
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awk->lex.ungotc_count = 0;
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return awk;
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}
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int xp_awk_close (xp_awk_t* awk)
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{
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xp_awk_clear (awk);
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if (xp_awk_detsrc(awk) == -1) return -1;
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xp_awk_tab_close(&awk->parse.func);
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xp_str_close (&awk->token.name);
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if (awk->__dynamic) xp_free (awk);
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return 0;
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}
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// TODO: write a function to clear awk->parse data structure.
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// this would be need either as a separate function or as a part of xp_awk_clear...
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// do i have to pass an option to xp_awk_clear to do this???
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void xp_awk_clear (xp_awk_t* awk)
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{
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/* clear parse trees */
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if (awk->tree.begin != XP_NULL) {
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xp_assert (awk->tree.begin->next == XP_NULL);
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xp_awk_clrpt (awk->tree.begin);
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awk->tree.begin = XP_NULL;
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}
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if (awk->tree.end != XP_NULL) {
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xp_assert (awk->tree.end->next == XP_NULL);
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xp_awk_clrpt (awk->tree.end);
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awk->tree.end = XP_NULL;
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}
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while (awk->tree.unnamed != XP_NULL) {
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xp_awk_node_t* next = awk->tree.unnamed->next;
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xp_awk_clrpt (awk->tree.unnamed);
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awk->tree.unnamed = next;
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}
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/* TODO: destroy pattern-actions pairs */
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/* TODO: destroy function list */
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}
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int xp_awk_attsrc (xp_awk_t* awk, xp_awk_io_t src, void* arg)
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{
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if (xp_awk_detsrc(awk) == -1) return -1;
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xp_assert (awk->src_func == XP_NULL);
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if (src(XP_AWK_IO_OPEN, arg, XP_NULL, 0) == -1) {
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awk->errnum = XP_AWK_ESRCOP;
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return -1;
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}
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awk->src_func = src;
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awk->src_arg = arg;
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awk->lex.curc = XP_CHAR_EOF;
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awk->lex.ungotc_count = 0;
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return 0;
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}
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int xp_awk_detsrc (xp_awk_t* awk)
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{
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if (awk->src_func != XP_NULL) {
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if (awk->src_func(XP_AWK_IO_CLOSE, awk->src_arg, XP_NULL, 0) == -1) {
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awk->errnum = XP_AWK_ESRCCL;
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return -1;
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}
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awk->src_func = XP_NULL;
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awk->src_arg = XP_NULL;
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awk->lex.curc = XP_CHAR_EOF;
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awk->lex.ungotc_count = 0;
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}
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return 0;
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}
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